优化

internal/service/emby_remote.go

@@ -21,6 +21,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"net"
 	"net/http"
 	"net/url"
 	"regexp"
@@ -237,6 +238,88 @@ func (r *EmbyRemoteService) ConfiguredRemoteHosts(ctx context.Context) []string
 	return hosts
 }
 
+// findAccountByHost 返回某条线路主机名匹配 host 的启用远程 Emby 账号（无则 nil）。
+func (r *EmbyRemoteService) findAccountByHost(ctx context.Context, host string) *model.StrmAccount {
+	host = normalizeHostKey(host)
+	if host == "" || r == nil || r.repo == nil || r.repo.StrmAccount == nil {
+		return nil
+	}
+	accounts, err := r.ListAccounts(ctx)
+	if err != nil {
+		return nil
+	}
+	for i := range accounts {
+		lines, _, err := r.LinesOf(&accounts[i])
+		if err != nil {
+			continue
+		}
+		for _, line := range lines {
+			u, err := url.Parse(line.URL)
+			if err != nil {
+				continue
+			}
+			if normalizeHostKey(u.Hostname()) == host {
+				return &accounts[i]
+			}
+		}
+	}
+	return nil
+}
+
+// normalizeHostKey 去掉端口并小写化，便于主机名字符串比较。
+func normalizeHostKey(host string) string {
+	host = strings.ToLower(strings.TrimSpace(host))
+	if host == "" {
+		return ""
+	}
+	if h, _, err := net.SplitHostPort(host); err == nil {
+		return strings.ToLower(strings.TrimSpace(h))
+	}
+	return host
+}
+
+// RemoteEmbyImageTokenForHost 返回图片代理回源某个远程 Emby 主机所需的当前
+// api_key。host 不属于任何已配置账号时返回 ok=false。
+func (r *EmbyRemoteService) RemoteEmbyImageTokenForHost(ctx context.Context, host string) (string, bool) {
+	if r == nil || r.repo == nil {
+		return "", false
+	}
+	acct := r.findAccountByHost(ctx, host)
+	if acct == nil {
+		return "", false
+	}
+	cfg, err := r.configOf(acct)
+	if err != nil || strings.TrimSpace(cfg.Token) == "" {
+		return "", false
+	}
+	return cfg.Token, true
+}
+
+// RefreshRemoteEmbyImageTokenForHost 强制用用户名/密码重新登录拥有该主机的账号
+// 并持久化新 token，供图片代理在上游 401 时自愈。仅配置了 api_key、没有登录
+// 凭据的账号无法自动刷新，返回错误由调用方按原失败处理。
+func (r *EmbyRemoteService) RefreshRemoteEmbyImageTokenForHost(ctx context.Context, host string) (string, error) {
+	if r == nil || r.repo == nil {
+		return "", errors.New("远程 Emby 服务不可用")
+	}
+	acct := r.findAccountByHost(ctx, host)
+	if acct == nil {
+		return "", fmt.Errorf("未找到主机 %s 对应的远程 Emby 账号", host)
+	}
+	cfg, err := r.configOf(acct)
+	if err != nil {
+		return "", err
+	}
+	if strings.TrimSpace(cfg.Username) == "" || strings.TrimSpace(cfg.Password) == "" {
+		return "", errors.New("远程 Emby 账号未配置用户名/密码，无法自动刷新 api_key")
+	}
+	cfg.Token = "" // 强制走登录流程，忽略已失效的 api_key
+	if err := r.ensureToken(ctx, acct, cfg); err != nil {
+		return "", err
+	}
+	return cfg.Token, nil
+}
+
 // AccountByID 按 ID 查找远程 Emby 挂载账号（不存在或类型不符返回 nil）。
 func (r *EmbyRemoteService) AccountByID(ctx context.Context, id string) *model.StrmAccount {
 	if strings.TrimSpace(id) == "" {
@@ -699,17 +782,23 @@ func (r *EmbyRemoteService) doGetOnLine(ctx context.Context, acct *model.StrmAcc
 			return err
 		}
 		if status == http.StatusUnauthorized && attempt == 0 {
-			// 401：只清当前线路的内存 token 并立即重认证；不在此时删除
-			// DB 里的 api_key——①外层还会按线路故障转移（其他线路可能
-			// 存有自己的 token）；②纯 api_key 账号删除后无法再认证，一次
-			// 线路误报就会把账号“砖化”。重认证成功后 persistToken 会用
-			// 新 token 覆盖 api_key。
+			// 401：只清当前线路的内存 token 并立即重认证；不先删 DB 里的
+			// api_key——纯 api_key 账号删除后无法再认证，一次线路误报就会
+			// 把账号“砖化”。重认证成功后把新 token 写回：既让重试用上正确
+			// 凭据，也避免每个后续请求都重新登录一次。
+			previous := cfg.Token
 			cfg.Token = ""
 			if err := r.ensureTokenOnLine(ctx, acct, cfg); err != nil {
 				return fmt.Errorf("认证重试失败: %w", err)
 			}
+			if q != nil {
+				q.Set("api_key", cfg.Token)
+			}
 			master.Token = cfg.Token
 			master.RemoteUserID = cfg.RemoteUserID
+			if cfg.Token != "" && cfg.Token != previous {
+				_ = r.persistToken(ctx, acct, cfg)
+			}
 			continue
 		}
 		if status >= 300 {

internal/service/emby_remote_image_auth_test.go

@@ -0,0 +1,100 @@
+package service
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"testing"
+
+	"go.uber.org/zap"
+
+	"github.com/truewhile/MeBox/internal/config"
+	"github.com/truewhile/MeBox/internal/model"
+	"github.com/truewhile/MeBox/internal/repository"
+)
+
+func TestRemoteEmbyImageTokenForHostUnknownHost(t *testing.T) {
+	svc, _, _ := newImageTagTestService(t)
+
+	if token, ok := svc.RemoteEmbyImageTokenForHost(t.Context(), "nope.example"); ok || token != "" {
+		t.Fatalf("got (%q,%v), want no token for a host not owned by any account", token, ok)
+	}
+}
+
+func TestRemoteEmbyImageTokenForHostMatchesConfiguredLine(t *testing.T) {
+	svc, _, _ := newImageTagTestService(t)
+
+	token, ok := svc.RemoteEmbyImageTokenForHost(t.Context(), "emby.test")
+	if !ok || token != "fake-token" {
+		t.Fatalf("got (%q,%v), want the account token for the configured line host", token, ok)
+	}
+}
+
+func TestRefreshRemoteEmbyImageTokenForHostRequiresCredentials(t *testing.T) {
+	svc, _, _ := newImageTagTestService(t)
+
+	// The account carries only an api_key — there is nothing to re-authenticate with.
+	if _, err := svc.RefreshRemoteEmbyImageTokenForHost(t.Context(), "emby.test"); err == nil {
+		t.Fatal("expected an error when the account has no username/password to re-authenticate with")
+	}
+}
+
+// TestRefreshRemoteEmbyImageTokenForHostRelogins 覆盖「token 被撤销后自动恢复」：
+// 用用户名/密码重新登录拿到新 token，并持久化，后续请求不再重复登录。
+func TestRefreshRemoteEmbyImageTokenForHostRelogins(t *testing.T) {
+	const fresh = "fresh-token"
+	logins := 0
+	upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != "/emby/Users/AuthenticateByName" {
+			http.NotFound(w, r)
+			return
+		}
+		logins++
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = w.Write([]byte(`{"AccessToken":"` + fresh + `","User":{"Id":"remote-user"}}`))
+	}))
+	defer upstream.Close()
+
+	db := newServiceTestDB(t, &model.StrmAccount{}, &model.EmbyMount{})
+	repos := repository.New(db)
+	svc := NewEmbyRemoteService(&config.Config{}, zap.NewNop(), repos, NewCryptoService("", zap.NewNop()))
+	acct := &model.StrmAccount{
+		Base:     model.Base{ID: "acct-refresh"},
+		Name:     "refresh-emby",
+		Provider: model.StrmProviderEmbyRemote,
+		Enabled:  true,
+		Config:   `{"url":"` + upstream.URL + `","api_key":"stale-token","username":"u","password":"p"}`,
+	}
+	if err := repos.StrmAccount.Create(t.Context(), acct); err != nil {
+		t.Fatalf("create account: %v", err)
+	}
+
+	u, err := url.Parse(upstream.URL)
+	if err != nil {
+		t.Fatal(err)
+	}
+	host := u.Hostname()
+
+	if token, ok := svc.RemoteEmbyImageTokenForHost(t.Context(), host); !ok || token != "stale-token" {
+		t.Fatalf("token before refresh = (%q,%v), want the stale stored token", token, ok)
+	}
+
+	token, err := svc.RefreshRemoteEmbyImageTokenForHost(t.Context(), host)
+	if err != nil {
+		t.Fatalf("refresh: %v", err)
+	}
+	if token != fresh {
+		t.Fatalf("refreshed token = %q, want %q", token, fresh)
+	}
+	if logins != 1 {
+		t.Fatalf("logins = %d, want 1", logins)
+	}
+
+	// 新 token 必须落库，否则每个请求都要重新登录一次。
+	if token, ok := svc.RemoteEmbyImageTokenForHost(t.Context(), host); !ok || token != fresh {
+		t.Fatalf("token after refresh = (%q,%v), want the persisted %q", token, ok, fresh)
+	}
+	if logins != 1 {
+		t.Fatalf("logins = %d, want 1 after the refresh was persisted", logins)
+	}
+}

internal/service/image_proxy.go

@@ -13,6 +13,7 @@
 package service
 
 import (
+	"context"
 	"errors"
 	"net"
 	"net/http"
@@ -65,6 +66,16 @@ type ImageProxy struct {
 	allowedHostsMu       sync.Mutex
 	allowedHostsCache    map[string]bool
 	allowedHostsAt       time.Time
+
+	// remoteEmbyTokenFn / refreshRemoteEmbyTokenFn let the proxy carry a fresh
+	// credential for configured remote-Emby mounts. Image URLs are minted from
+	// whatever token the account had when the payload was built, so a URL can
+	// outlive its api_key; these hooks re-supply the current one and force a
+	// re-login when the mount rejects it.
+	remoteEmbyTokenFn        func(ctx context.Context, host string) (string, bool)
+	refreshRemoteEmbyTokenFn func(ctx context.Context, host string) (string, error)
+	remoteEmbyTokenMu        sync.Mutex
+	remoteEmbyTokenCache     map[string]remoteEmbyImageToken
 }
 
 const (

internal/service/image_proxy_remote.go

@@ -14,6 +14,10 @@ import (
 var errImageProxyRequestSetup = errors.New("image proxy request setup failed")
 var errImageProxyNonImageContent = errors.New("upstream returned non-image content")
 
+// errImageProxyUnauthorized 表示上游以 401/403 拒绝了回源凭据。它与普通失败
+// 分开，是为了让调用方对挂载 Emby 做一次重认证再重试，而不是直接下发占位图。
+var errImageProxyUnauthorized = errors.New("upstream rejected image credentials")
+
 // prefetchCardResizeOptions 对应前端 ARTWORK.posterCard（见 web/src/api/client.ts）：
 // 卡片是海报墙最常请求的档位，刮削阶段预生成它能让首个列表请求直接命中缓存。
 // 若前端调整该预设，这里只是白生成一份用不到的档位（约几十 KB），不影响正确性。
@@ -183,16 +187,27 @@ func (p *ImageProxy) removeUnusableImageCache(cachePath, failPath string) {
 }
 
 func (p *ImageProxy) fetchAndCacheRemoteImage(ctx context.Context, raw, host, cachePath, failPath string) (remoteImageFetchResult, error) {
-	var lastErr error
-	for _, candidate := range p.remoteImageFetchClients(host) {
-		result, err := p.fetchRemoteImageOnce(ctx, raw, host, candidate, cachePath, failPath)
-		if err == nil {
-			return result, nil
+	result, lastErr := p.fetchRemoteImageAcrossClients(ctx, raw, host, cachePath, failPath)
+	if lastErr == nil {
+		return result, nil
+	}
+	if errors.Is(lastErr, errImageProxyRequestSetup) {
+		return remoteImageFetchResult{}, lastErr
+	}
+	// 已挂载的远程 Emby 认 X-Emby-Token 请求头，但轮换前生成的图片 URL 里还留着
+	// 旧 api_key。上游拒绝时重新登录拥有该主机的账号一次再重试，而不是一直下发
+	// 占位图、等人工去改账号配置。
+	if errors.Is(lastErr, errImageProxyUnauthorized) {
+		token, refreshErr := p.refreshRemoteEmbyTokenForHost(ctx, host)
+		if refreshErr != nil {
+			logImageFetchError(p.log, "imageproxy: remote emby re-auth failed", host, "reauth", refreshErr)
+		} else if token != "" {
+			retried, retryErr := p.fetchRemoteImageAcrossClients(ctx, raw, host, cachePath, failPath)
+			if retryErr == nil {
+				return retried, nil
+			}
+			lastErr = retryErr
 		}
-		if errors.Is(err, errImageProxyRequestSetup) {
-			return remoteImageFetchResult{}, err
-		}
-		lastErr = err
 	}
 	if p.canUseExternalImageFallback() && isDoubanImageHost(host) {
 		data, ctype, _, err := fetchRemoteImageWithCurl(ctx, raw, host)
@@ -210,6 +225,24 @@ func (p *ImageProxy) fetchAndCacheRemoteImage(ctx context.Context, raw, host, ca
 	return remoteImageFetchResult{}, redactSensitiveError(lastErr)
 }
 
+// fetchRemoteImageAcrossClients 按直连/代理顺序依次尝试，返回首个成功结果。
+// 请求构造失败立即中止（重试无意义）；401/403 会继续尝试另一个客户端，并把
+// errImageProxyUnauthorized 作为最终错误交给调用方去刷新挂载 token。
+func (p *ImageProxy) fetchRemoteImageAcrossClients(ctx context.Context, raw, host, cachePath, failPath string) (remoteImageFetchResult, error) {
+	var lastErr error
+	for _, candidate := range p.remoteImageFetchClients(host) {
+		result, err := p.fetchRemoteImageOnce(ctx, raw, host, candidate, cachePath, failPath)
+		if err == nil {
+			return result, nil
+		}
+		if errors.Is(err, errImageProxyRequestSetup) {
+			return remoteImageFetchResult{}, err
+		}
+		lastErr = err
+	}
+	return remoteImageFetchResult{}, lastErr
+}
+
 // fetchAndCacheRemoteImageShared coalesces concurrent requests for the same
 // upstream image. A poster can appear in the hero, a shelf and the detail page
 // at the same time; without this guard every resize variant may fetch the same

internal/service/image_proxy_remote_auth.go

@@ -0,0 +1,102 @@
+package service
+
+import (
+	"context"
+	"net/http"
+	"strings"
+	"time"
+)
+
+// remoteEmbyImageTokenTTL 是 host → api_key 的缓存时长。海报墙首屏一口气请求
+// 几十张图，逐个回读数据库不值得；token 轮换时 401 重认证会立即覆盖这份缓存。
+const remoteEmbyImageTokenTTL = 60 * time.Second
+
+type remoteEmbyImageToken struct {
+	token string
+	at    time.Time
+}
+
+// SetRemoteEmbyAuthProvider 注入「按主机名取当前远程 Emby api_key」的回调。
+// 图片代理回源已挂载的远程 Emby 时用它替换 URL 里可能已过期的凭据。
+func (p *ImageProxy) SetRemoteEmbyAuthProvider(fn func(ctx context.Context, host string) (string, bool)) {
+	if p == nil {
+		return
+	}
+	p.remoteEmbyTokenFn = fn
+}
+
+// SetRemoteEmbyAuthRefresher 注入「强制重新登录并返回新 api_key」的回调。上游以
+// 401/403 拒绝旧 token 时调用一次，再重试拉图，从而不需要人工改账号配置。
+func (p *ImageProxy) SetRemoteEmbyAuthRefresher(fn func(ctx context.Context, host string) (string, error)) {
+	if p == nil {
+		return
+	}
+	p.refreshRemoteEmbyTokenFn = fn
+}
+
+// remoteEmbyTokenForHost 返回挂载 Emby 的当前 token，短期缓存避免每张图都查库。
+// 「不是挂载主机」的结果同样缓存，否则普通图床（TMDb/Douban 等）的每张海报都会
+// 白白查一次账号表。
+func (p *ImageProxy) remoteEmbyTokenForHost(ctx context.Context, host string) string {
+	if p == nil || p.remoteEmbyTokenFn == nil || strings.TrimSpace(host) == "" {
+		return ""
+	}
+	p.remoteEmbyTokenMu.Lock()
+	if cached, ok := p.remoteEmbyTokenCache[host]; ok && time.Since(cached.at) < remoteEmbyImageTokenTTL {
+		p.remoteEmbyTokenMu.Unlock()
+		return cached.token
+	}
+	p.remoteEmbyTokenMu.Unlock()
+
+	token, ok := p.remoteEmbyTokenFn(ctx, host)
+	if !ok {
+		token = ""
+	}
+	p.cacheRemoteEmbyToken(host, token)
+	return token
+}
+
+func (p *ImageProxy) cacheRemoteEmbyToken(host, token string) {
+	if p == nil || strings.TrimSpace(host) == "" {
+		return
+	}
+	p.remoteEmbyTokenMu.Lock()
+	if p.remoteEmbyTokenCache == nil {
+		p.remoteEmbyTokenCache = make(map[string]remoteEmbyImageToken, 8)
+	}
+	p.remoteEmbyTokenCache[host] = remoteEmbyImageToken{token: token, at: time.Now()}
+	p.remoteEmbyTokenMu.Unlock()
+}
+
+// refreshRemoteEmbyTokenForHost 强制重认证一次并刷新缓存。没有配置刷新器、或
+// 账号无法自动刷新（如仅填了 api_key）时返回空串，调用方按原错误处理。
+func (p *ImageProxy) refreshRemoteEmbyTokenForHost(ctx context.Context, host string) (string, error) {
+	if p == nil || p.refreshRemoteEmbyTokenFn == nil || strings.TrimSpace(host) == "" {
+		return "", nil
+	}
+	token, err := p.refreshRemoteEmbyTokenFn(ctx, host)
+	if err != nil {
+		return "", err
+	}
+	if token != "" {
+		p.cacheRemoteEmbyToken(host, token)
+	}
+	return token, nil
+}
+
+// applyRemoteEmbyAuth 用账号当前 token 覆盖回源请求上的凭据。已配置的远程 Emby
+// 以 X-Emby-Token 请求头为准，所以图片 URL 里带的是轮换前的旧 api_key 也不会再
+// 被采纳；同时把查询参数里的 api_key 一并改写，避免旧值干扰。
+func (p *ImageProxy) applyRemoteEmbyAuth(ctx context.Context, req *http.Request, host string) {
+	if p == nil || p.remoteEmbyTokenFn == nil || req == nil || req.URL == nil {
+		return
+	}
+	token := p.remoteEmbyTokenForHost(ctx, host)
+	if token == "" {
+		return
+	}
+	req.Header.Set("X-Emby-Token", token)
+	q := req.URL.Query()
+	q.Set("api_key", token)
+	req.URL.RawQuery = q.Encode()
+}

internal/service/image_proxy_remote_auth_test.go

@@ -0,0 +1,126 @@
+package service
+
+import (
+	"bytes"
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"sync"
+	"testing"
+)
+
+// TestImageProxyInjectsRemoteEmbyToken 覆盖封面空白问题：图片 URL 里签发时的
+// api_key 已经失效，但账号当前 token 有效。代理回源必须用当前 token 覆盖旧值，
+// 否则挂载 Emby 的封面会一直 401、下发占位图。
+func TestImageProxyInjectsRemoteEmbyToken(t *testing.T) {
+	const current = "current-token"
+	upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Header.Get("X-Emby-Token") != current {
+			http.Error(w, "unauthorized", http.StatusUnauthorized)
+			return
+		}
+		w.Header().Set("Content-Type", "image/jpeg")
+		_, _ = w.Write(testJPEG)
+	}))
+	defer upstream.Close()
+
+	u, err := url.Parse(upstream.URL)
+	if err != nil {
+		t.Fatal(err)
+	}
+	proxy := newUpstreamImageProxy(t, u.Host)
+	proxy.SetRemoteEmbyAuthProvider(func(context.Context, string) (string, bool) {
+		return current, true
+	})
+
+	raw := upstream.URL + "/emby/Items/abc/Images/Primary?api_key=stale-token"
+	rec := httptest.NewRecorder()
+	if err := proxy.Serve(t.Context(), rec, httptest.NewRequest(http.MethodGet, "/api/img", nil), raw); err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(rec.Body.Bytes(), testJPEG) {
+		t.Fatalf("body = %x, want the upstream image served with the current token", rec.Body.Bytes())
+	}
+}
+
+// TestImageProxyRefreshesRemoteEmbyTokenOn401 覆盖 token 在运行中被撤销的场景：
+// 账号当前 token 也被上游拒绝时，代理应重新登录一次并重试，且只刷新一次。
+func TestImageProxyRefreshesRemoteEmbyTokenOn401(t *testing.T) {
+	const (
+		stale = "stale-token"
+		fresh = "fresh-token"
+	)
+	var mu sync.Mutex
+	refreshes := 0
+	upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Header.Get("X-Emby-Token") != fresh {
+			http.Error(w, "unauthorized", http.StatusUnauthorized)
+			return
+		}
+		w.Header().Set("Content-Type", "image/jpeg")
+		_, _ = w.Write(testJPEG)
+	}))
+	defer upstream.Close()
+
+	u, err := url.Parse(upstream.URL)
+	if err != nil {
+		t.Fatal(err)
+	}
+	proxy := newUpstreamImageProxy(t, u.Host)
+	proxy.SetRemoteEmbyAuthProvider(func(context.Context, string) (string, bool) {
+		return stale, true
+	})
+	proxy.SetRemoteEmbyAuthRefresher(func(context.Context, string) (string, error) {
+		mu.Lock()
+		refreshes++
+		mu.Unlock()
+		return fresh, nil
+	})
+
+	raw := upstream.URL + "/emby/Items/abc/Images/Primary?api_key=" + stale
+	rec := httptest.NewRecorder()
+	if err := proxy.Serve(t.Context(), rec, httptest.NewRequest(http.MethodGet, "/api/img", nil), raw); err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(rec.Body.Bytes(), testJPEG) {
+		t.Fatalf("body = %x, want the upstream image served after re-auth", rec.Body.Bytes())
+	}
+
+	mu.Lock()
+	got := refreshes
+	mu.Unlock()
+	if got != 1 {
+		t.Fatalf("refreshes = %d, want exactly 1 re-auth", got)
+	}
+}
+
+// TestImageProxyLeavesNonEmbyHostsUntouched 确认新的凭据注入只作用于已配置的
+// 远程 Emby 主机：普通图床（这里用 provider 返回 ok=false 模拟）不受影响。
+func TestImageProxyDoesNotInjectForUnknownHost(t *testing.T) {
+	var gotHeader string
+	upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		gotHeader = r.Header.Get("X-Emby-Token")
+		w.Header().Set("Content-Type", "image/jpeg")
+		_, _ = w.Write(testJPEG)
+	}))
+	defer upstream.Close()
+
+	u, err := url.Parse(upstream.URL)
+	if err != nil {
+		t.Fatal(err)
+	}
+	proxy := newUpstreamImageProxy(t, u.Host)
+	proxy.SetRemoteEmbyAuthProvider(func(context.Context, string) (string, bool) {
+		return "", false
+	})
+
+	raw := upstream.URL + "/img/cover.jpg"
+	rec := httptest.NewRecorder()
+	if err := proxy.Serve(t.Context(), rec, httptest.NewRequest(http.MethodGet, "/api/img", nil), raw); err != nil {
+		t.Fatal(err)
+	}
+	if gotHeader != "" {
+		t.Fatalf("X-Emby-Token = %q, want no credential header for a non-Emby host", gotHeader)
+	}
+}

internal/service/image_proxy_remote_fetch.go

@@ -71,6 +71,8 @@ func (p *ImageProxy) fetchRemoteImageOnce(ctx context.Context, raw, host string,
 		return remoteImageFetchResult{}, errImageProxyRequestSetup
 	}
 	applyRemoteImageHeaders(req, host, raw)
+	// 已挂载的远程 Emby：用账号当前 token 覆盖旧凭据，返回头形式对端优先采纳。
+	p.applyRemoteEmbyAuth(ctx, req, host)
 
 	resp, err := candidate.client.Do(req)
 	if err != nil {
@@ -80,6 +82,9 @@ func (p *ImageProxy) fetchRemoteImageOnce(ctx context.Context, raw, host string,
 	defer resp.Body.Close()
 	if resp.StatusCode >= 400 {
 		p.log.Warn("imageproxy: upstream returned non-OK", zap.String("host", host), zap.String("client", candidate.name), zap.String("status", resp.Status))
+		if resp.StatusCode == http.StatusUnauthorized || resp.StatusCode == http.StatusForbidden {
+			return remoteImageFetchResult{}, errImageProxyUnauthorized
+		}
 		return remoteImageFetchResult{}, errors.New("upstream returned " + resp.Status)
 	}
 	if err := p.streamImageToCache(cachePath, failPath, resp.Body); err != nil {

internal/service/service_builder.go

@@ -237,6 +237,15 @@ func (b *serviceContainerBuilder) initImageProxy() {
 		b.c.ImageProxy.SetAllowedRemoteHostsProvider(func() []string {
 			return b.c.EmbyRemote.ConfiguredRemoteHosts(context.Background())
 		})
+		// 远程 Emby 的图片 URL 会带着签发时的 api_key 长期缓存/下发；轮换后
+		// URL 里的旧值必然过期。回源时改用账号当前 token，并在上游 401/403 时
+		// 重新登录一次再重试，封面图不再依赖人工改账号。
+		b.c.ImageProxy.SetRemoteEmbyAuthProvider(func(ctx context.Context, host string) (string, bool) {
+			return b.c.EmbyRemote.RemoteEmbyImageTokenForHost(ctx, host)
+		})
+		b.c.ImageProxy.SetRemoteEmbyAuthRefresher(func(ctx context.Context, host string) (string, error) {
+			return b.c.EmbyRemote.RefreshRemoteEmbyImageTokenForHost(ctx, host)
+		})
 	}
 	b.c.Scan.SetImageProxy(b.c.ImageProxy)
 	b.c.Scraper.SetImageProxy(b.c.ImageProxy)